Coordinating Minister for the National COVID-19 Immunisation Programme Khairy Jamaluddin recently announced that there is not enough data for Malaysia to consider mixing two different COVID-19 vaccines. What do current studies on mixing vaccines show, and what kind of data would help Malaysian authorities to make an evidence-based decision? We find out more from Dr Vinod Balasubramaniam, molecular virologist, who also weighs in on how we should address concerns among those who are vaccine hesitant.

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